Ampicillin is an antibiotic that kills bacterial cells by disrupting the formation of cell walls. However, the pARA-R plasmid has the ampicillin resistance gene, which produces a protein that breaks down ampicillin. What is the purpose of growing bacteria that have been transformed in the presence of ampicillin

To eliminate bacteria that failed to take in the plasmid.

Explanation:

Research shows that plasmid DNA is only taken in by small percentage of bacteria in a large population.

Therefore, the need of growing transformed bacteria in the presence of ampicillin is very important. The main reason of this process is to kill off or eliminate bacteria that have failed to take in the plasmid, due to their possession of recombinant DNA plasmid pARA-R (an ampicillin resistance gene), that allows them to survive.

However, after completion of the aforementioned procedure, the bacteria that have been transformed will be able to take in the plasmid.

This is to ensure  survival of desired bacterial cells.

Explanation:

The  growing of  transformed bacteria with ampicillin-resistant gene, ( in presence of ampicillin ) is for the ampicillin to disrupts the the process of synthesising protein  which inhibit its chemotherapeutic actions, therefore  promoting the survival of transformed  bacteria.

However, bacteria which are  without  plasmid,   which are not transformed,without the  ampicillin resistance gene, (since the action of ampicillin is not block,) will not be able to grow in the ampicillin medium,  and therefore  will be  killed.Thus aiding the survival of transformed bacteria only.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.